Incandescent lamp.



T. J.1 LITLB, JR. INGANDESCENT LAMP. APPLICATION FILED JAN. 27. 1912.

Patented Ju`1y2, 1912.

T. J. LITLE, J3. INCANDESGENT LAMP. APPLIOATION FILED JAN. 27, 1912.

Patented July 2, 1912 SL01@i L mi 2 SHEETS-SHEET l.

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WITNESSES THOIVIS JAMES LITLE, JR., OF WOODBUBY, NEW JERSEY, ASSIGNOR TO WELSBACH LIGHT COMPANY, OF GLOUCESTER CITY, NEW JERSEY, A. CORPORATION 0F NEW JERSEY.

Specification of Letters Patent.

INCANDSCENT LAMP.

Patented July 2,1912.

Application filed January 27, 1912. Serial No. 673,762.

To all whom 'it may concern:

Be it known that I, THOMAS J. Lrrnu, Jr., a resident of `Woodbury, Gloucester county, State of New Jersey, have invented a new and useful Improvement in Incandescent Lamps, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specitication, in which- Figure 1 is a vertical section showing one form of lamp having my invention applied thereto. Fig. 2 is a side elevation showing the actuating devices for the gas valve and air shutter or valve. Fig. 3 is a partial sectional view of Fig. 2 at right angles thereto. Fig. 4. is a sectional plan view ofI the operating mechanism for the valves. 5 is a perspective view ot one form of air shutter or valve, and Fig. 6 isv a side elevation of the gas valve and air shutter actuating levers, and the chain pulleys therefor.

My invention has relation to incandescent gas lamps, and more particularly to lamps of the manifold inverted type, lalthough it may be applied to incandescent lamps of other types.

The invention has relation more particularly to a novel means for actuating the gas valve and the air regulating device or shutter so as to supply pure gas to the mantles on lighting, thus positively eliminating all danger of tlarebacks.

The precise nature of my invention will be best understood by reference to the accompanying drawings, it being'premised, however, that various changes may be made .in the details ot construction of the several parts, wit-hout departing from the spirit and scope of my invention, as defined in the appended claims.

Referring to the accompanying drawings, in which I have illustrated one form of my invention, the numeral 2 designatesthe cas ing of an incandescent gas lamp of the type above referred to, and 3 the globe.

4 is the mixing tube, which is shown as eX- 'tending downwardly and inwardly through an opening inside of the casing 3, havingat its lower end a manifold 5, to which the burner tubes 6 are connected.

7 designates the usual inverted `mantles connected to the lower ends of the tubes 6,

8 is the gas supply pipe which is connected to thevalve casing 9 at its lower end.

10 is the valve spindle which carries a suitable valve within the casing.

11 is the gas'jet tube which is connected to the outletof the valve chamber, and iteX- tends downwardly into the upper endof the mixing tube 4 and is provided with the usual needle valve 12.

13 is the air regulating shutter or valve which is arranged to reciprocate within the upper end portion of the mixing tube 4, in the form of a hollow cylindrical sleeve which, when raised to the position shown in the drawings, is arranged to close theA air inletopening 14 at the upper end of the mixing tube. Projecting outwardly from the air shutter 13 is a pin 15 which passes through an opening in one arm of a lever 16 which is tulcrumed on the valve stem or spindle 10, the other arm 16a of this lever being connected by a light tension spring 17 with a projection extending outwardly from the valve casing, as indicated at 18.

19 is two-armed lever, which is fastened to the valve stem 10. Connected to one end of this lever 19 is a valve closing rod 20, and connected to the other end of this lever is a valve opening rod 21. Connected to the same arm 1 6a of the lever 16 to which the 'coil spring 17 isconnectedis a coil spring 22, which is considerably stronger than the coil spring 17. The other end of this coil spring 22 is connected to a closing chain 20*JL at 23.

20b is a short chain connected to the end of the closing rod 20 and the point 23.

21*l is the opening chain which is connected to the end of the opening rod 21 and 21b is a link connected to the point 23 and the opening chain 211. l

'Assuming the parts .to be in the position shown in the drawings, in which both the gas valve and air shutter or valve are closed,

and which is the normal position for the valves when the lamp is not lighted, the

chain 21n is drawn downwardly, which will shutter or valve 13 down-4 los . chain 2Ob is taken up, thev rod 20 will be the leverlt, so that 'when the gas valve is .13 by extending the spring 17; and as soon 'be extended by a further downward pull on 19'1 connected to the 'lever 19 and which exwardlyin the mixin tube and permit air to enter the mixing tu e through the opening, 14 adjacent to the gas inlet to said tube. When it is desired to cut olf the gas from the lamp the chain' 20a is pulled downwardly, which will rst close the air valve or shutter asthe shutter is closed, the'spring 22 will the chain 2W and as soon as -the slack in the actuated to rock the lever 19 back to the position shown in the drawings and retainthe lever 16 in this position by means of a lug tends at right angles thereto over the end of movedto its closed position the air. valve .is also held closed, as the power ,of the springl'? is not great enough to overcome the 'friction of the parts to shift the valves. t,

, 5. In a gas lamp, a mixing tube having an The' advantages of my invention result from the provision' of gas and air valves for' incandescent gas lamps which `are provided with actuating devices arranged to hold the airvallve closed when the .gas valve isv closed. Further from the lprovision of means for closing the airvalve'before the gasvalve is actuated. to cut off the supply of gas to the burner, together. with means for holding the. air valve in its closed position during 'the opening movement of the gas valve, which' means'is arranged tg/ hold the air valve in its closed position .until the gas valve actuating mechanism ,is' released. I

I claim:

l. In a gas lamp, a mixing tube having an air inlet and a gas inlet, a separate valve for each of said inlets, an operating device connected to the gas valve, an operating device connected to the air valve, and an actuating device connected to the gas and air'val've operating devices arranged in extinguishing the light to first move the air valve to its closed position and then close the gas valve; substantially as described'.

2. In a gas lamp, a mixing tube having an air inlet and a gas inlet, a separate valve tor each of said inlets, an operating device co'nnected to the gasvalve, an operating device connected to the air valve, and an actuating device connected to t-he gas and air valve operating devices and arranged to iirst close, theair valve and then close the gas valve, together with means on the gas valve operating device for retaining the air valve in its closed position; substantiallyas described.

3. In a gas lamp, a mixing tubehaving an air inlet and a gas inlet, a separate valve for each of said'inlets, an operating device connected to the gas valve, an operatingdevice connectedA to the air valve, and an actuating device connected to ythe gas and air valveoperating devicesI arranged to, first close theair valve and then closet-he gas valve, to-

jgether with means 011 the gas valve operating .device for retaining the air valve in its "f connected to the gas valve, Vflexible actuat ing devices connectedtoeach end of the as valvelever, and a resilient connection etween the air valve lever and both' of said actuating devices and arranged to, hold the air valve in 'its closed position when either of said flexible devices 1s actuated; substantially as described.

air inlet and a gas inlet, a separate valve for each of said inlets,an operating lever connectedA to the air valve, an operatinglever connected to the gas valve, an actuating` device connected to 'one'endof the gas' valve operating lever to open the valve, an actuating device connected to thel other end of said lever, a resilient'connection between the air valve operating lever and both of said devices and arranged to hold the air valve in its closed positionwhen either'device is drawn, and means for opening the air shutter when the actuating device for opening the gas valve has been released; substantially as described.

6. In a` gas lamp, a mixing tube having an air inlet and a gas inlet, a separate valve for each of said inlets, an operating lever connected to the air valve, an operating lever connected to the gas valve, an actuating device connected to one end of the gas valve operating lever to open the valve, an actuating device connected to the other Vend of said lever to close the valve, a resilient connection between the air valve operating lever and both of said devices and arranged to hold the air valve in its closed position when either device is drawn, and means .on the gas valve lever for retaining the air valve in its closed position when the last mentioned lactuating device is released; substantially as described.

In testimony whereof, I have hereunto set my hand.

J. H. JOHNSON, EDGAR LEN'roN. 

